/* correctIQ.c

This routine restores quadrature between arms of an analytic signal
possibly distorted by ADC hardware.

This file is part of a program that implements a Software-Defined Radio.

Copyright (C) 2004, 2005, 2006 by Frank Brickle, AB2KT and Bob McGwier, N4HY

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

The authors can be reached by email at

ab2kt@arrl.net
or
rwmcgwier@comcast.net

or by paper mail at

The DTTS Microwave Society
6 Kathleen Place
Bridgewater, NJ 08807
*/

#include <include.h>

IQ
newCorrectIQ (REAL phase, REAL gain)
{
  IQ iq = (IQ) safealloc (1, sizeof (iqstate), "IQ state");
  iq->phase = phase;
  iq->gain = gain;
  return iq;
}

void
delCorrectIQ (IQ iq)
{
  safefree ((char *) iq);
}

void
correctIQ (CXB sigbuf, IQ iq)
{
  int i;

  for (i = 0; i < CXBhave (sigbuf); i++)
    {
      CXBimag (sigbuf, i) += iq->phase * CXBreal (sigbuf, i);
      CXBreal (sigbuf, i) *= iq->gain;
    }
}
